Purchase instructions:packaging includes 10pcs electrostatic cotton (other item only show, now not integrated in the gross sales content)Product Name: HEPA purifier in addition to pm2 dust information superhighway electrostatic electret cottonSize: 70x30cmFeatures:Electrostatic electret clear out using 3-D acupuncture process, much less wind resistance, cleanability. Effectively make bigger the clear out life of three to five times. The length of the product forall varieties of purifier HEPA filter, applicable to every kind of air-conditioning on-hookcar filter. Millet, Philips, Brussels, TCL, and so on. Can efficiently extend the life of theoriginal filter, cheap, if fact be told save you money. General xiaomi air purifier 2 / 1 / Suitable for:xiaomi purifier 2 / 1 / Other brands of air purifier, air conditioning dust, central air con inlet, windows, dust, anti-fog, etc.